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How to adjust the layer size by dragging the mouse in javascript

Source: Internet
Author: User
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How to adjust the layer size by dragging the mouse in javascript

This example describes how to change the layer size by dragging the mouse in javascript. Share it with you for your reference. The specific implementation method is as follows:

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<Html>

<Head>

<Title> drag to change the layer size </title>

<Meta content = "text/html; charset = gb2312" http-equiv = "Content-Type">

<Style> {

Box-sizing: border-box; moz-box-sizing: border-box

}

# TestDiv {background-color: buttonface; background-repeat: repeat;

Background-attachment: scroll; color: # rja5; height: 300px;

Left: 30px; overflow: hidden; width: 500; z-index: 2;

Border: 2px outset white; margin: 0px; padding: 2px;

Background-position: 0% 50%}

Body {font-family: Verdana; font-size: 9pt}

# InnerNice {background-color: white; background-repeat: repeat;

Background-attachment:

Scroll; color: #3969A5; height: 100%; overflow: auto;

Width: 100%; border: 2px inset white; padding: 8px;

Background-position: 0% 50%}

</Style>

<SCRIPT language = javascript>

Var theobject = null;

Function resizeObject (){

This. el = null; // pointer to the object

This. dir = ""; // type of current resize (n, s, e, w, ne, nw, se, sw)

This. grabx = null; // Some useful values

This. graby = null;

This. width = null;

This. height = null;

This. left = null;

This. top = null;

}

Function getDirection (el ){

Var xPos, yPos, offset, dir;

Dir = "";

XPos = window. event. offsetX;

YPos = window. event. offsetY;

Offset = 8; // The distance from the edge in pixels

If (yPos <offset) dir + = "n ";

Else if (yPos> el. offsetHeight-offset) dir + = "s ";

If (xPos <offset) dir + = "w ";

Else if (xPos> el. offsetWidth-offset) dir + = "e ";

Return dir;

}

Function doDown (){

Var el = getReal (event. srcElement, "className", "resizeMe ");

If (el = null ){

Theobject = null;

Return;

}

Dir = getDirection (el );

If (dir = "") return;

Theobject = new resizeObject ();

Theobject. el = el;

Theobject. dir = dir;

Theobject. grabx = window. event. clientX;

Theobject. graby = window. event. clientY;

Theobject. width = el. offsetWidth;

Theobject. height = el. offsetHeight;

Theobject. left = el. offsetLeft;

Theobject. top = el. offsetTop;

Window. event. returnValue = false;

Window. event. cancelBubble = true;

}

Function doUp (){

If (theobject! = Null ){

Theobject = null;

}

}

Function doMove (){

Var el, xPos, yPos, str, xMin, yMin;

XMin = 8; // The smallest width possible

YMin = 8; // height

El = getReal (event. srcElement, "className", "resizeMe ");

If (el. className = "resizeMe "){

Str = getDirection (el );

// Fix the cursor

If (str = "") str = "default ";

Else str + = "-resize ";

El. style. cursor = str;

}

// Dragging starts here

If (theobject! = Null ){

If (dir. indexOf ("e ")! =-1)

Theobject. el. style. width = Math. max (xMin, theobject. width + window. event. clientX-theobject. grabx) + "px ";

If (dir. indexOf ("s ")! =-1)

Theobject. el. style. height = Math. max (yMin, theobject. height + window. event. clientY-theobject. graby) + "px ";

If (dir. indexOf ("w ")! =-1 ){

Theobject. el. style. left = Math. min (theobject. left + window. event. clientX-theobject. grabx, theobject. left + theobject. width-xMin) + "px ";

Theobject. el. style. width = Math. max (xMin, theobject. width-window. event. clientX + theobject. grabx) + "px ";

}

If (dir. indexOf ("n ")! =-1 ){

Theobject. el. style. top = Math. min (theobject. top + window. event. clientY-theobject. graby, theobject. top + theobject. height-yMin) + "px ";

Theobject. el. style. height = Math. max (yMin, theobject. height-window. event. clientY + theobject. graby) + "px ";

}

Window. event. returnValue = false;

Window. event. cancelBubble = true;

}

}

Function getReal (el, type, value ){

Temp = el;

While (temp! = Null) & (temp. tagName! = "BODY ")){

If (eval ("temp." + type) = value ){

El = temp;

Return el;

}

Temp = temp. parentElement;

}

Return el;

}

Document. onmousedown = doDown;

Document. onmouseup = doUp;

Document. onmousemove = doMove;

</SCRIPT>

</Head>

<Body>

<Div class = "resizeMe" id = "testDiv">

<Div id = "innerNice">

<P align = "center"> </p>

<P align = "center">

Please drag the mouse at the border </p>

<P> </p>

<P> </p>

<P> </p>

</Div>

</Div>

</Body>

</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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